package day05;

public class ArrayDemo3 {
    public static void main(String[] args) {
        int[] arr = new int[3];
        System.out.println("数组的长度:"+arr.length);
        System.out.println("数组的第一个元素是:"+arr[0]);
        arr[0]=100;
        arr[1]=200;
        arr[2]=300;
        System.out.println(arr[2]);
        System.out.println(arr[arr.length-1]);
    }
}
